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山东省青岛市微山二线船闸过闸公路桥主桥上部结构为三跨预应力混凝土变截面直腹板连续刚构,跨径布置为47m+75m+47m。变截面单箱单室截面,垂直腹板。箱梁顶板宽15m,底板宽8m,梁底缘按抛物线变化。腹板厚度由50cm渐变到40cm,仅设支点横隔板,不设跨中横隔板。箱梁项面设1.5%横坡。箱梁采用三向束、底板钢束及合拢钢束等束型两端张拉,横向预应力钢束布置于箱梁的顶预应力体系,纵向预应力钢束
The upper structure of main bridge of Weishan second-line shiplock gate of Qingdao Weishan Bridge in Shandong Province is a continuous rigid frame with straight span of three-span prestressed concrete with a span of 47m + 75m + 47m. Single-section cross-section single-chamber cross-section, vertical web. Box girder roof width 15m, floor width 8m, beam bottom edge parabolic changes. The thickness of the web is gradually changed from 50cm to 40cm. Only the fulcrum diaphragm is set. There is no cross-over diaphragm. Box girder project set 1.5% cross slope. Box girder using three beam, the bottom of the beam and the closure of bundles such as bundled beam at both ends of the tension, transverse prestressed steel beam placed in the roof prestressed box system, longitudinal prestressed steel beam